Royal Mosque, Isfahan

• The symmetry group of the tiling is 2*22 (cmm).
• All the internal angles of the constituent polygons are a multiple of 45°.
• Contains one regular 8-pointed star polygon with vertex angle of 90°.
• There are two non-regular reflective tiles.
• The tiling satisfies the interlace condition and has no finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 83 polygons.

1. Page 278, Fig 157 (Hunat Hatun Complex, Kayseri, Turkey) of Jay Bonner. Islamic Geometric Patterns, Springer, 2016. ISBN 978144190216. [bonner] {Largest Islamic tile collection in print}(1237-8AD, 634-5AH)
2. Page 144, photo 99 (Friday mosque, Isfahan, Iran. Low-level pattern) of Jay Bonner. Islamic Geometric Patterns, Springer, 2016. ISBN 978144190216. [bonner] {Largest Islamic tile collection in print}(1611AD, 1020AH)
3. Photo by David Wade: IRA 0501 (Royal Mosque, Isfahan, Iran) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}(1611AD, 1020AH)

• Wade photo IRA 0501
• Wade photo IRA 0718

• Tiling whose tile angles are a multiple of 45° and whose lengths are p+q*sqrt(2).

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